GAIA - ESA mission to map a billion stars

GAIA - ESA mission to map a billion stars

The Gaia space telescope will make the largest, three-dimensional map of our Galaxy by surveying more than a thousand million stars. Gaia will monitor each of its target stars about 70 times over a five-year period. It will precisely chart their positions, distances, movements, and changes in brightness. It is expected to discover hundreds of thousands of new celestial objects, such as extra-solar planets and brown dwarfs, and observe hundreds of thousands of asteroids within our own Solar System. The mission will also study about 500 000 distant quasars and will provide stringent new tests of Albert Einstein's General Theory of Relativity.